Feldspar
Potassium Feldspar (KAlSi3O8)
Category
Browse mineral (synthetic paper and ink polymorph) specimens identified by the Rock Identifier community.
Feldspar
Potassium Feldspar (KAlSi3O8)
Sodalite
Sodalite (Na8Al6Si6O24Cl2)
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
Pyrite
Iron Disulfide (FeS2)
Carnelian Agate
Carnelian (Silicon Dioxide - SiO2)
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
Botryoidal Malachite
Malachite - Cu2CO3(OH)2
Black Sapphire
Corundum (Al2O3 with inclusions of hematite or ilmenite)
Green Aventurine
Silicon dioxide (SiO2) with fuchsite inclusions
Black Diamond / Black Sapphire
Carbon (C) or Corundum (Al2O3)
Peridot (Olivine)
Magnesium Iron Silicate (Mg, Fe)2SiO4
Quartz (Milky/Crystal Variety)
Silicon Dioxide (SiO2)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Sodalite
Na8(Al6Si6O24)Cl2
Green Fluorite
Calcium Fluoride (CaF2)
Clear Quartz
Silicon Dioxide (SiO2)
Muscovite Mica (with Quartz)
Muscovite (KAl2(AlSi3O10)(OH)2)
Ruby
Corundum (Al2O3 with Chromium traces)
Bloodstone (Heliotrope)
Silicon Dioxide (SiO2) with inclusions of Hematite
Yellow Ochre / Limonite
Limonite (FeO(OH)·nH2O)
Sodalite
Sodalite - Na8(Al6Si6O24)Cl2
Lepidolite
Lepidolite - K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
White Quartz (Tumbled)
Silicon Dioxide (SiO2)
Banded Agate
Chalcedony (Silicon Dioxide, SiO2)
Orthoclase Feldspar (Twinning Specimen)
Orthoclase (KAlSi3O8)
Blue Calcite
Calcium Carbonate (CaCO3)
Limonite (Iron Ore)
FeO(OH)·nH2O (Hydrous ferric oxide)
Smoky Quartz (Faceted Beads)
Silicon Dioxide (SiO2)
Almandine Garnet
Almandine [Fe3Al2(SiO4)3]
Aventurine (Green)
Aventurine Quartz (SiO2 + Fuchsite inclusions)
Diamond (in jewelry mount)
Carbon (C)
Chalcedony
Chalcedony (SiO2)
Garnet (Almandine/Pyrope series)
Silicate mineral (Almandine: Fe3Al2Si3O12; Pyrope: Mg3Al2Si3O12)
Pyrite
Iron Sulfide (FeS2)
Ruby
Corundum (Al2O3 with Chromium traces)
Carnelian (Red Chalcedony)
Silicon Dioxide (SiO2)
Amazonite
Microcline (K(AlSi3O8))
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
Quartz Pebble (Water-worn)
Silicon Dioxide (SiO2)
Sodalite
Na8(Al6Si6O24)Cl2 (Sodium Aluminum Silicate Chloride)
Cupronickel (on a 1981 Mexico 20 Pesos coin)
Copper-Nickel Alloy (Cu75Ni25)
Arsenopyrite in Quartz Matrix
Arsenopyrite (FeAsS)